19-2507; Rev 0; 7/02
Ultra-Low-Power Series Voltage Reference
General Description
The MAX6129 micropower, low-dropout bandgap volt-
age reference combines ultra-low supply current and
low drift in a miniature 5-pin SOT23 surface-mount
package that uses 70% less board space than compa-
rable devices in an SO package. This series-mode volt-
age reference sources up to 4mA and sinks up to 1mA
of load current. A wide 2.5V to 12.6V supply range,
ultra-low 5.25µA (max) supply current, and a low
200mV dropout voltage make these devices ideal for
battery-operated systems.
An initial accuracy of 0.4% and a 40ppm/°C (max) tem-
perature coefficient make the MAX6129 suitable for
precision applications. Additionally, an internal com-
pensation capacitor eliminates the need for an external
compensation capacitor and ensures stability with load
capacitances up to 10µF.
The MAX6129 provides six output voltages of 2.048V,
2.5V, 3V, 3.3V, 4.096V, and 5V. The MAX6129 is avail-
able in a 5-pin SOT23 package and is specified over
the extended temperature range (-40°C to +85°C).
o
4mA Output Source Current
o
1mA Output Sink Current
o
±0.4% (max) Initial Accuracy
o
40ppm/°C (max) Temperature Coefficient
o
2.5V to 12.6V Supply Range
o
Low 200mV Dropout
o
Stable with Capacitive Loads Up to 10µF
o
No External Capacitors Required
o
Miniature 5-Pin SOT23 Package
Features
o
Ultra-Low 5.25µA (max) Supply Current
MAX6129
Ordering Information
PART
OUTPUT
PIN-
VOLTAGE
TEMP RANGE
PACKAGE
(V)
2.048
2.500
3.000
3.300
4.096
5.000
Applications
Battery-Powered Systems
Hand-Held Instruments
Precision Power Supplies
A/D and D/A Converters
MAX6129_EUK21-T -40°C to +85°C 5 SOT23-5
MAX6129_EUK25-T -40°C to +85°C 5 SOT23-5
MAX6129_EUK30-T -40°C to +85°C 5 SOT23-5
MAX6129_EUK33-T -40°C to +85°C 5 SOT23-5
MAX6129_EUK41-T -40°C to +85°C 5 SOT23-5
MAX6129_EUK50-T -40°C to +85°C 5 SOT23-5
Note:
The MAX6129 is available in A or B grades. Choose the
desired grade from the Selector Guide and insert the suffix in
the blank above to complete the part number.
Selector Guide appears at end of data sheet.
Typical Operating Circuit
V
IN
= 2.5V TO 12.6V
Pin Configuration
TOP VIEW
*
IN
IN
1
5
OUT
GND
2
MAX6129
OUT
MAX6129
N.C.
3
GND
4
N.C.
SOT23
*CAPACITOR IS OPTIONAL
________________________________________________________________
Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Ultra-Low-Power Series Voltage Reference
MAX6129
ABSOLUTE MAXIMUM RATINGS
IN to GND ...............................................................-0.3V to +13V
OUT to GND ..............-0.3V to the lower of +6V and (V
IN
+ 0.3V)
Output to GND Short-Circuit Duration........................Continuous
Continuous Power Dissipation (T
A
= +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS—MAX6129_21 (V
OUT
= 2.048V)
(V
IN
= 2.5V, I
OUT
= 0, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
OUTPUT
Output Voltage
Output Voltage Temperature
Coefficient (Notes 2, 3)
Line Regulation
Load Regulation
Output Short-Circuit Current
Long-Term Stability
Thermal Hysteresis
DYNAMIC CHARACTERISTICS
Noise Voltage
Ripple Rejection
Turn-On Settling Time
INPUT
Supply Voltage Range
Supply Current
Change in Supply Current
V
IN
I
IN
I
IN
/V
IN
V
IN
= 2.5V to 12.6V
2.5
12.6
5.25
1.5
V
µA
µA/V
e
OUT
f = 0.1Hz to 10Hz
f = 10Hz to 1kHz
To V
OUT
= 0.1% of final value
30
115
43
450
µV
P-P
µV
RMS
dB
µs
V
OUT
TCV
OUT
T
A
= +25°C
MAX6129A
MAX6129B
27
0.22
2.4
60
150
140
(Note 4)
MAX6129A (±0.4%)
MAX6129B (±1%)
2.0398
2.0275
2.0480
2.0480
2.0562
2.0685
40
100
200
0.7
5.5
V
ppm/°C
µV/V
µV/µA
mA
ppm
ppm
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
∆V
OUT
/∆V
IN
V
IN
= 2.5V to 12.6V
I
OUT
= 0 to 4mA
∆V
OUT
/
∆I
OUT
I
OUT
= 0 to -1mA
I
SC
∆V
OUT
/time 1000 hours at +25°C
∆V
OUT
/∆V
IN
V
IN
= 2.5V
±200mV,
f = 120Hz
t
R
2
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